Attachment of moving picture film to the film spool



Aug 16,- 1932. L. GOLDHAMMER 1,371,983

ATTACHIENT OP "DYING PICTURE FILM TO THE FILM SPOOL Filed Jan. 22. 1929 .on the core of t e spo Patented Aug. 16, 1932 UNITED STATES PATENT ogrica LEO GOLDHAMIER, OP MUNICH, GERILAIY, A88IGNOB TO AGILANSCO CORPORATION, OF IBINGHAHPTON, NEW YORK, A CORPORATION 01' NEW YORK ATTACHMENT OF MOVING PICTURE I! TO THE FILE SPOOL Application filed January 83, 1928, Serial la.

The present invention relates to a method of attaching the end of a movin picture film strip to the core of a film spoo and to motion picture film strips and film spools suitable for this method.

Hitherto this attachment has been by means of a blade sprin or similar clamping device 01. This necessitated sharply bending the film incurring liability of breakage, or the film clamped to the spool core by a spring has no fixed attachment but is only connected by friction, so that it can be detached by a strong pull.

I found that these disadvantages are avoided by making one or several incisions between the perforations of the film band, of such shape that by bending the film there are formed projecting tongues directed away from the film end which tongues engage, automatically from below, in 3. corresponding slot in the spool core or a part belongin thereto when the film is somewhat ietracte The film may be curved by inserting it in a number of arc-shaped incisions 2, while Fig.

2 shows in section the strip curved so as to produce the tongues 3. Fig. 3 is a cross section of a spool core 5 with the end of a film strip inserted in the slot 6 and the curved channel 8, which is formed by a curved metal blade 4 atta'ched to the 1 core. This blade has a cut out slot 7 in which en ages from below the projecting tongue 3 o the film strip.

I claim:

1. In a cinematographic film roll a fihn strip provided near one end between the perforations with an arc-shaped incision which forms on the bent film a projecting tongue directed away from the end of the film strip.

2. In a combined cinematographic film roll and spool, a spool core, a curved channel in said core, a slot in the outer or peripheral blade defining said channel, a perforated film 1 with a 884,288, and in Germany January 35, 198i.

.strip having its end portion inserted within said curved channel, said film strip being provided near its end and between the rforations thereof with one or more incisions whereby projecting tongues, directed away from the end of the film strip, are formed when the film is bent, one of said tongues being 1n engaging relation with said slot.

3. In a com ined cinematographic film roll and spool, a spool core, a curved metal apron or blade secured to the periphery of said spool 4 and forming a channel between the apron and the spool, a slot in the apron, a perforated film strip having its end portion inserted within said curved channel, said film strip being provided near its end and between the perforations thereof with one or more incisions whereby projecting tongues, directed away from the end of the film strip, are formed when the film is bent, one of said 

